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Reddit stock jumps on inclusion in S&P 500

S&P Dow Jones Indices said Reddit will join the benchmark as AvalonBay leaves after an acquisition-related removal.

  • On Tuesday, August 18, 2026, Reddit Inc. will join the S&P 500, replacing AvalonBay Communities Inc. effective prior to the opening of trading.
  • Equity Residential is acquiring AvalonBay Communities in a deal expected to be completed soon, creating the S&P 500 vacancy that Reddit will fill.
  • Separately, Sun Communities Inc. will replace Webster Financial Corp. in the S&P MidCap 400 effective prior to the opening of trading on Thursday, August 20, 2026.
  • Following the merger, the combined entity will be renamed Vivmark Residential and remain in the S&P 500, while Banco Santander acquires Webster Financial.
  • Since Charles Dow invented the first index in 1884, S&P Dow Jones Indices has maintained rule-based methodologies that determine large-cap status for companies like Reddit.
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The Courier-TribuneThe Courier-Tribune
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Reddit Set to Join S&P 500 and Sun Communities to Join S&P MidCap 400

NEW YORK, Aug. 13, 2026 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P 500 and S&P MidCap 400:

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CNBC broke the news in Englewood Cliffs, United States on Thursday, August 13, 2026.
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